99942 Apophis (2004 MN4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.1911663196 ± 2.00e+00
Semi-major axis (a)0.9223804710 AU ± 3.00e+00
Inclination (i)3.34095673° ± 4.00e+00
Long. of Asc. Node (Ω)203.89962943° ± 5.00e+00
Arg. of Perihelion (ω)126.67282559° ± 6.00e+00
Mean Anomaly (M)312.80548085° ± 2.46e-06
Mean Motion (n)1.1126206784°/day ± 5.43e+00
Perihelion dist (q)0.74605239 AU ± 3.05e+00
Aphelion dist (Q)1.09870855 AU ± 4.02e+00
Orbital Period0.88586012 yr ± 4.32e+00
NGA Modelr2
A1-3.03172826e-03 AU/d²
A2-2.37461812e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-29
RMS Residual0.213″
Uncertainty0
Orbit TypeAten
MOID0.000007 AU
Observations Used8720
Oppositions2
Arc Total2004-2021
First Observation Used2004-03-15
Last Observation Used2021-05-20
Observations (10797)
Date Type RA Dec Mag Band Observatory
2021-01-19 03:06:03 C 11 42 51.52 -17 55 20.0 U 511
2021-01-19 03:09:06 C 11 42 51.43 -17 55 21.3 U 511
2021-01-19 03:12:09 C 11 42 51.35 -17 55 22.6 U 511
2021-01-19 03:15:31 C 11 42 51.25 -17 55 24.2 U 511
2021-01-19 03:18:33 C 11 42 51.16 -17 55 25.5 U 511
2021-01-19 03:21:36 C 11 42 51.08 -17 55 26.8 U 511
2021-01-19 03:24:39 C 11 42 50.99 -17 55 28.2 U 511
2021-01-19 03:27:42 C 11 42 50.91 -17 55 29.5 U 511
2021-01-19 08:41:45 S 11 42 42.82 -17 57 39.2 L C53
2021-01-19 08:51:44 S 11 42 43.93 -17 58 01.3 L C53
2021-01-19 14:43:37 S 11 42 38.93 -17 59 01.7 L C53
2021-01-19 14:53:38 S 11 42 37.12 -17 59 05.3 L C53
2021-01-19 15:03:38 S 11 42 35.53 -17 59 27.2 L C53
2021-01-19 17:39:54 C 11 42 34.81 -18 01 37.5 q Q21
2021-01-19 17:44:27 C 11 42 34.68 -18 01 39.6 q Q21
2021-01-19 17:50:30 C 11 42 34.44 -18 01 41.9 q Q21
2021-01-19 17:56:32 C 11 42 34.26 -18 01 44.4 q Q21
2021-01-19 18:02:36 C 11 42 34.07 -18 01 47.2 q Q21
2021-01-19 18:08:39 C 11 42 33.88 -18 01 50.4 q Q21
2021-01-20 01:34:48 C 11 42 25.704 -18 04 58.74 V Z84
2021-01-20 01:52:27 C 11 42 25.154 -18 05 06.63 V Z84
2021-01-20 05:59:57 C 11 42 20.01 -18 06 01.6 V W88
2021-01-20 06:30:38 C 11 42 19.03 -18 06 15.7 V W88
2021-01-20 07:00:01 C 11 42 18.03 -18 06 28.5 V W88
2021-01-20 16:17:18 C 11 42 05.49 -18 11 09.0 q Q21
2021-01-20 16:24:52 C 11 42 05.22 -18 11 12.4 q Q21
2021-01-20 16:32:26 C 11 42 04.97 -18 11 16.4 q Q21
2021-01-20 16:39:58 C 11 42 04.69 -18 11 19.5 q Q21
2021-01-20 16:47:33 C 11 42 04.48 -18 11 21.9 q Q21
2021-01-20 16:55:05 C 11 42 04.21 -18 11 25.4 q Q21
2021-01-20 17:02:40 C 11 42 03.99 -18 11 29.7 q Q21
2021-01-20 17:10:13 C 11 42 03.61 -18 11 32.8 q Q21
2021-01-20 17:17:46 C 11 42 03.43 -18 11 35.6 q Q21
2021-01-20 17:25:20 C 11 42 03.16 -18 11 38.5 q Q21
2021-01-20 17:32:53 C 11 42 02.88 -18 11 41.3 q Q21
2021-01-20 17:40:26 C 11 42 02.58 -18 11 44.8 q Q21
2021-01-20 17:48:01 C 11 42 02.34 -18 11 47.7 q Q21
2021-01-20 17:55:33 C 11 42 02.12 -18 11 51.8 q Q21
2021-01-20 18:03:08 C 11 42 01.79 -18 11 54.3 q Q21
2021-01-20 18:10:41 C 11 42 01.54 -18 11 57.4 q Q21
2021-01-20 18:18:14 C 11 42 01.20 -18 12 00.0 q Q21
2021-01-20 18:25:48 C 11 42 01.02 -18 12 04.2 q Q21
2021-01-20 18:33:21 C 11 42 00.75 -18 12 06.7 q Q21
2021-01-20 18:40:54 C 11 42 00.44 -18 12 09.8 q Q21
2021-01-20 18:48:29 C 11 42 00.19 -18 12 14.0 q Q21
2021-01-20 18:56:01 C 11 41 59.93 -18 12 16.3 q Q21
2021-01-20 19:03:36 C 11 41 59.73 -18 12 18.7 q Q21
2021-01-20 19:11:09 C 11 41 59.37 -18 12 22.9 q Q21
2021-01-20 19:18:42 C 11 41 59.11 -18 12 26.1 q Q21
2021-01-21 07:35:27 C 11 41 40.43 -18 16 46.4 q Y00
Radar Observations (50)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2005-01-27 23:31:00 -100849.1434 0.25 Hz 2380 -1 -1
2005-01-29 00:00:00 192028507.13 4 us 2380 -1 -1
2005-01-29 00:00:00 -102512.9059 0.25 Hz 2380 -1 -1
2005-01-30 00:18:00 195808170.79 4.5 us 2380 -1 -1
2005-01-30 00:18:00 -103799.8178 0.15 Hz 2380 -1 -1
2005-08-07 17:07:00 8186.8 0.2 Hz 2380 -1 -1
2006-05-06 12:49:00 -118256.8 0.1 Hz 2380 -1 -1
2012-12-21 11:10:00 57992.443 0.25 Hz 8560 -14 -14
2012-12-22 11:00:00 102682986.05 0.25 us 8560 -14 -14
2012-12-22 11:00:00 57880.25 0.1 Hz 8560 -14 -14
2013-01-03 09:20:00 97449107.61 0.25 us 8560 -14 -14
2013-01-03 09:20:00 36629.285 0.1 Hz 8560 -14 -14
2013-01-03 10:00:00 97439308.71 3 us 8560 -14 -14
2013-01-03 10:50:00 97428425.46 0.25 us 8560 -14 -14
2013-01-05 08:40:00 30404.009 0.2 Hz 8560 -14 -14
2013-01-05 10:40:00 96911591.52 0.25 us 8560 -14 -14
2013-01-05 10:40:00 20031.16 0.1 Hz 8560 -14 -14
2013-01-05 10:50:00 96910218.03 3 us 8560 -14 -14
2013-01-06 08:20:00 26660.815 0.1 Hz 8560 -14 -14
2013-01-06 09:30:00 20775.144 0.1 Hz 8560 -14 -14
2013-01-08 08:10:00 15496.441 0.1 Hz 8560 -14 -14
2013-01-09 08:00:00 96451449.73 0.2 us 8560 -14 -14
2013-01-09 08:00:00 9670.119 0.1 Hz 8560 -14 -14
2013-01-09 09:20:00 2690.401 0.1 Hz 8560 -14 -14
2013-01-10 08:00:00 96472652.72 0.2 us 8560 -14 -14
2013-01-10 08:00:00 2590.857 0.1 Hz 8560 -14 -14
2013-01-10 09:40:00 96473924.8 0.2 us 8560 -14 -14
2013-01-11 07:20:00 -1589.599 0.2 Hz 8560 -14 -14
2013-01-14 08:10:00 97258343.56 0.2 us 8560 -14 -14
2013-01-14 08:10:00 -30561.776 0.1 Hz 8560 -14 -14
2013-01-14 09:50:00 97283037.17 0.2 us 8560 -14 -14
2013-01-15 06:30:00 -30666.291 0.1 Hz 8560 -14 -14
2013-01-16 06:30:00 98086754 1 us 8560 -14 -14
2013-01-16 06:30:00 -39582.277 0.2 Hz 8560 -14 -14
2013-01-16 07:50:00 -46641.384 0.1 Hz 8560 -14 -14
2013-01-17 06:20:00 -47875.142 0.1 Hz 8560 -14 -14
2013-02-18 00:56:00 -76760.475 0.2 Hz 2380 -1 -1
2013-02-18 01:37:00 157906444.15 0.25 us 2380 -1 -1
2013-02-18 01:37:00 -78041.365 0.2 Hz 2380 -1 -1
2013-02-19 01:08:00 -78105.657 0.2 Hz 2380 -1 -1
2013-02-20 00:38:00 -78070.341 0.2 Hz 2380 -1 -1
2013-02-20 01:26:00 163578875.87 0.25 us 2380 -1 -1
2013-02-20 01:26:00 -79560.965 0.2 Hz 2380 -1 -1
2013-02-21 01:04:00 -79697.13 0.2 Hz 2380 -1 -1
2013-03-15 23:59:00 235220855.07 2 us 2380 -1 -1
2013-03-15 23:59:00 -80977.5254 0.238 Hz 2380 -1 -1
2021-03-03 06:40:00 29329.8 0.4 Hz 8560 -14 -14
2021-03-05 07:00:00 112426746.52 1 us 8560 -14 -14
2021-03-08 02:50:00 112625015.08 1 us 8560 -14 -14
2021-03-11 08:20:00 113796393.86 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)